Thermal analysis of Fe-carbide and Fe-C mixtures

Authors

R Tongsri
B Vetayanugul

Publication Date

2010-07-01

Abstract

Differential thermal analysis (DTA) was employed to monitor changes which occurred during heating of Fe-carbide and Fe-C mixtures. The DTA curves showed a relationship between endothermic peaks and phase transformations given in the Fe-C phase diagram. The transformations included (i) magnetic Fe to non-magnetic Fe, (ii) pure α-Fe to pure γ-Fe, (iii) γ + Fe3C → Liquid and (iv) pure γ-Fe to pure δ-Fe. Melting of the Fe-SiC powder compacts when sintered at temperatures higher than 1200°C was revealed and indicated by the endothermic peak of 1230°C. This peak corresponded to the transformation of γ + Fe3C → Liquid. That meant that decomposition of SiC particles had occurred, and Si and C atoms subsequently diffused into iron particles. DTA curves of the Fe-TiC, Fe-WC and Fe-VC mixtures did not show peaks corresponding to melting. This indicated that TiC, WC and VC were stable when they were brought into contact with iron at elevated temperatures.

First Page

45

Last Page

49

Recommended Citation

Tongsri, R and Vetayanugul, B (2010) "Thermal analysis of Fe-carbide and Fe-C mixtures," Journal of Metals, Materials and Minerals: Vol. 20: No. 1, Article 8.
Available at: https://digital.car.chula.ac.th/jmmm/vol20/iss1/8